Adjustable hacksaw



June 13, 1961 s, DlcKsTl-:IN

ADJUSTABLE HACKSAW Filed June 22, 1960 gnu-Eleu -n SAMUEL DICKSTEIN ym ANVR/175V United States Patent 2,988,123 ADJUSTABLE HACKSAW Samuel' Dickstein, 75 YChadwick Road, Teaneck, N J. Filed .lune 22, 1960, Ser. No. 38,042 1 Claim. (Cl. 14S-34) This invention concerns an adjustable hacksaw.

According to the invention there is provided a hacksaw having a frame in the form of an L-square. The frame is adapted to contain a supply of doubleedge hacksaw blades. The hacksaw has a handle adapted to receive the frame and a hacksaw blade telescopically. Thus, the hacksaw is adapted to employ blades of various sizes and even fragments of broken blades of very short length.

It is4 therefore one object to` provide a hacksaw having a frarne` adapted to contain a supply of blades.

A further object is to provide a hacksaw having a handle with blade and frame telescopically associated therewith for adjusting the hacksaw to employ blades of various sizes.

A still further object is to provide a hacksaw of the character described wherein the frame is constructed as an L-square.

Yet another object is to provide a hacksaw with a blade adapted to be supported so that it extends beyond the frame for cutting through plate-like or sheet material.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claim in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

FIG. 1 is a perspective view of a hacksaw embodying the invention, showing an extended blade in dot-dash lines.

FIG. 2 is an end View taken online 2-2 of FIG. 1.

FIG. 3 is an enlarged fragmentary vertical sectional view taken on line 3-3 of FIG. 2.

FIG. 4 is a perspective view of the hacksaw frame, blades being shown partly exposed, and a blade being shown attached to the vertical leg of the frame and a blade being shown forming an extension of the frame.

FIG. 5 is a side view of a blade adjustment member.

FIG. 6 is an edgewise view of the member of FIG. 5.

FIG. 7 is an end view of the member taken on line 7-7 of FIG. 6.

FIG. 8 -is a cross-sectional view on the line 8-8 of FIG. 3.

Referring in detail to the drawings, in FIG. 1 there is shown a hacksaw 10 including a frame I12 and a handle 14. The frame is in the form of an inverted L-square including a rectangular tubular bar 16 marked with a scale or rule 18. Depending from the bar at one end 20 is a leg 22. The leg is a thick strip of metal marked with a scale 24. End 20 of the bar is closed. The other end 26 `of the bar is open to receive a plurality of blades 30 in a compartment 32 of the hollow bar. A setscrew 34 may be threaded in aligned holes 36, 38 n the side walls at the open end of the bar for retaining the blades in the compartment. The end 26 of the bar is slidably received in a rectangular passage 40 formed vin the tubular upper or back portion 41 of the handle 14. A thumb screw 42 threaded in the bottom of the portion 41 permits the bar 16 to be adjustably iixed in position in the handle. The handle includes two legs 44, 46 spaced apart and integral with the upper frame portion 41. Leg 46 is corrugated at 43 on its inner edge to provide a good hand grip for the user of the hacksaw.

A substantially rectangular-shaped foot or base 66 is formed on the bottom end of the leg 22 of the frame 12.

Patented June 13, 1961 The foot or base is formed with a central hole 68 having a' corrugated wall. The elongated shank portion 70 of a rectangular-shaped plate 72 extends through the hole 68 and a shoulder 74 on the plate at its juncture with the shank portion limits movement of the plate through the hole. The shank portion 68 is flat and formed with corrugations 76 on its opposed long 'edges adjacent the shoulder and screw threads 77 outwardly thereof. A pair of spaced short cylindrical members 78 project from one surface of the plate 72, and a pin 80 projects centrally from the free end of each cylindrical member. A ringor nut 82 is mounted on the projecting end of the shank portion 70 and is formed with corrugations on its inner periphery for coaction with the corrugations on the edges of the shank, portion whereby the plate 72 may be tilted at an angle to the vertical as viewed in FIGS. l and 4. The plate 72 serves as a bracket for detachably supporting a blade 30.

1A tubular base 48, square in cross section, is formed integrally with the legs 44 and 46 and extends across the space therebetween. A blade supporting bar 52 is tiltably disposed inthe bore 50 of the base. Bar 52 is flat and has opposite centrally indented edges 54 and 56 with screw threads 57 on the outer end for receiving a thumb nut 58. A pin 62 projects laterally from one surface of the bar through a slot 64 formed in the side of base 48. The pin carries a spacer 63.

In order to apply a blade 30 to the hacksaw, one end of the blade is attached to the base 48 by slipping a hole 60 of -the blade, at said end, over the pin 62 on the bar 52 projecting through the slot 64 in the base, and by slipping a pair of said holes 60 at the other end over the pair of pins -80 projecting from the bracket plate 72. The blade is thus iirmly and detachably supported on the frame of the hacksaw.

If a blade snaps or breaks it is still usable by moving the handle 14 with the broken blade along the bar 16 toward the leg 22 of the frame and slipping a pair of holes 60 adjacent the broken end over the pair of pins 80 on the bracket plate 72.

The hacksaw may be used for sawing through hat sheets, for example, by attaching a short blade 30' to the frame by slipping a pair of the holes 60 at one end of said blade 30 over the pair of pins 80 with the `other end eX- tending outwardly and beyond the leg 22 of the frame as shown in dotted lines in FIG. l.

`In order to use the frame 12 alone as an L-square, the thumb screw 42 is released and the handle I4 slid off of the bar 16. The bracket plate 72 is also detached by sliding the ring or nut 82 off of the shank portion 70 and withdrawing the shank portion through the hole 68 in the base 66.

Blades of different lengths may be accommodated by sliding the handle 14 along the bar 16. Blades may be inserted into and removed from the compartment 32 in the bar 16 by manipulating the screw 34. The blades have teeth on opposite long edges so that the blade may be reversed for either set of teeth.

'Ihe handle 14 is preferably made of rigid plastic material but may be made of metal if desired. The frame 12 may also be made of metal or plastic.

While I have illustrated and described the preferred embodiment of my invention, it is to be understood that I do not limit myself lto the precise construction herein disclosed and that various changes and modifications may be made within the scope of the invention as delined in the appended claim.

Having thus described my invention, what I claim as new, `and desire to secure by United States Letters Patent is:

A hacksaw comprising a frame, a handle, said frame including a tubular bar having -a leg secured at one end aoeeuaa 3 l and extending perpendicularly thereto, said handle having upper and base portions [at the opposite end of the tubular bar integrally joined to a pair of spaced legs, one of said -legs providing a hand grip, lsaid upper portion having a passage slidably receiving said bar, a threaded bracket member, said base portion having a passage slidably and tiltably receiving said bracket member, a main blade supported between said handle and the first-named leg, said blade having spaced holes tberealong, means on said handle and bar leg engaging selected holes at opposite ends of the blade, said bar having an elongated compartment with an open end for receiving a plurality of blades therein, and a set screw for closing said open end to retain said blades in the compartment, said threaded bracket member provided with a nut threaded thereon for fastening said member in the passage in said base portion, said means including a bracket secured to the bar leg, a pin extending from the threaded bracket member and a pair of pins extending from said bracket engaging in the spaced holes of said main blade, said base portion having a slotted side, the pin on the threaded bracket member extending laterally through the slot in said side, an auxiliary blade having spaced holes therealong, one end of said auxiliary blade being mounted on said pair of pins between said bracket and said main blade, and the other end of said auxiliary blade extending outwardly beyond said bar leg and forming an extension of said main blade.

References Cited in the le of this patent UNITED STATES PATENTS 138,362 Baggs Apr. 29, 1873 2,612,196 Bouschor Sept. 30, 1952 FOREIGN PATENTS 537,934. Great Britain July 14, 1941 2,789,818 Great Britain Jan. 29, 1958 677,929 France Dec. 19, 1929 142.623 Great Britain May 13, 1920 

